MRK
Merck & Co., Inc.$143.81-1.04 (-0.72%)Prev Close$144.85·MCap$364.55B·P/E40.51·Vol4.38M·Yield0.02%
▲
Buys (12M)
0
$0.00
▼
Sells (12M)
20
$57.14M
◆
Net Activity
Net Seller
$57.14M
●
Active Insiders
10
last 12 mo
Over the past 12 months, insider activity at Merck & Co., Inc. (MRK) has been exclusively selling, with 0 insider purchases totaling $0.00 and 20 insider sales totaling $57.14M. The most recent insider transaction was by Guindo Chirfi (officer: EVP, Access, Policy & Comms), who sold $1.35M worth of shares on Aug 13, 2026. Merck & Co., Inc. operates in the Healthcare sector, within the Drug Manufacturers - General industry, with a market cap of $364.55B.
MRK Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Aug 13, 2026 | Guindo Chirfi | officer: EVP, Access, Policy & Comms | Sell | 10,000 | $135.00 | $1.35M | 36,613 |
| Aug 13, 2026 | Zachary Jennifer | officer: EVP, General Counsel | Sell | 80,315 | $133.46 | $10.72M | 45,509-64% |
| Aug 12, 2026 | DeLuca Richard R. | officer: EVP&Pres, Merck Animal Heallth | Sell | 45,320 | $131.12 | $5.94M | 134,703-25% |
| Aug 10, 2026 | DeLuca Richard R. | officer: EVP&Pres, Merck Animal Heallth | Sell | 6,050 | $130.38 | $788.8K | 160,732 |
| Aug 7, 2026 | Maraldo David R. | officer: EVP & Pres. MMD | Sell | 2,686 | $128.72 | $345.7K | 18,212 |
| Aug 7, 2026 | Guindo Chirfi | officer: EVP, Access, Policy & Comms | Sell | 15,000 | $131.00 | $1.97M | 46,613 |
| Aug 7, 2026 | Williams David Michael | officer: EVP,Chief Info&Digital Officer | Sell | 34,705 | $128.77 | $4.47M | 31,716-52% |
| Feb 12, 2026 | Guindo Chirfi | officer: Chief Marketing Officer | Sell | 10,000 | $121.46 | $1.21M | 60,615 |
| Feb 10, 2026 | Li Dean Y | officer: Executive VP & President, MRL | Sell | 10,235 | $117.52 | $1.20M | 92,035 |
| Feb 9, 2026 | Guindo Chirfi | officer: Chief Marketing Officer | Sell | 10,000 | $118.41 | $1.18M | 70,615 |
| Feb 9, 2026 | Zachary Jennifer | officer: EVP, General Counsel | Sell | 38,835 | $119.15 | $4.63M | 68,916-36% |
| Feb 6, 2026 | Davis Robert M | director, officer: Chairman, CEO & President | Sell | 47,434 | $118.04 | $5.60M | 476,064 |
| Feb 6, 2026 | Li Dean Y | officer: Executive VP & President, MRL | Sell | 15,087 | $118.77 | $1.79M | 102,270 |
| Feb 6, 2026 | DeLuca Richard R. | officer: EVP&Pres, Merck Animal Heallth | Sell | 37,685 | $120.92 | $4.56M | 160,174 |
| Feb 6, 2026 | Litchfield Caroline | officer: EVP & CFO | Sell | 41,997 | $119.61 | $5.02M | 90,192-32% |
| Feb 6, 2026 | Guindo Chirfi | officer: Chief Marketing Officer | Sell | 20,000 | $121.88 | $2.44M | 80,615 |
| Feb 6, 2026 | Williams David Michael | officer: EVP,Chief Info&Digital Officer | Sell | 5,000 | $121.91 | $609.5K | 30,838 |
| Feb 6, 2026 | Oosthuizen Johannes Jacobus | officer: President, U.S. Market | Sell | 15,000 | $121.87 | $1.83M | 21,197-41% |
| Feb 6, 2026 | Smart Dalton E. III | officer: SVP Fin. - Global Controller | Sell | 6,400 | $119.68 | $765.9K | 10,605-38% |
| Nov 4, 2025 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 8,614 | $83.59 | $720.0K | 0 |
| Aug 5, 2025 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 8,432 | $79.29 | $668.6K | 0 |
| May 2, 2025 | Smart Dalton E. III | SVP Fin. - Global Controller | Sell | 290 | $84.05 | $24.4K | 0 |
| May 2, 2025 | Larson Betty D | EVP, Chief HR Officer | Sell | 5,153 | $84.71 | $436.5K | 0 |
| Apr 29, 2025 | Smart Dalton E. III | SVP Fin. - Global Controller | Sell | 4,262 | $82.76 | $352.7K | 0 |
| Feb 20, 2025 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 8,500 | $84.09 | $714.7K | 0 |
| Feb 11, 2025 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 6,404 | $87.28 | $558.9K | 0 |
| Feb 7, 2025 | Downing Cristal N | Chief Comm. & Public Afrs Ofcr | Sell | 2,361 | $88.76 | $209.6K | 0 |
| Mar 11, 2024 | Merck & Co., Inc. | Buy | 21,397,205 | $23.00 | $492.14M0.9% OS | 1,000 | |
| Feb 15, 2024 | Davis Robert M | Chairman, CEO & President | Sell | 235,021 | $125.69 | $29.54M | 373,651-39% |
| Feb 15, 2024 | Litchfield Caroline | EVP & CFO | Sell | 38,291 | $125.50 | $4.81M | 50,908-43% |
| Feb 14, 2024 | Romanelli Joseph | President, Human Health Int?l | Sell | 1,000 | $124.89 | $124.9K | 19,569 |
| Feb 12, 2024 | Li Dean Y | Executive VP & President, MRL | Sell | 14,702 | $125.50 | $1.85M | 46,242 |
| Feb 8, 2024 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 1,451 | $127.57 | $185.1K | 19,812 |
| Feb 5, 2024 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 18,959 | $127.17 | $2.41M | 23,327-45% |
| Feb 2, 2024 | Zachary Jennifer | EVP, General Counsel | Sell | 49,499 | $126.97 | $6.28M | 29,058-63% |
| Feb 2, 2024 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 50,694 | $126.65 | $6.42M | 23,619-68% |
| Nov 13, 2023 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 2,081 | $102.38 | $213.1K | 18,191 |
| Nov 9, 2023 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 43,823 | $105.03 | $4.60M | 111,764-28% |
| Aug 15, 2023 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,250 | $109.01 | $463.3K | 22,935 |
| Aug 4, 2023 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,500 | $105.49 | $474.7K | 27,185 |
| Aug 3, 2023 | Romanelli Joseph | President, Human Health Int?l | Sell | 89 | $107.37 | $9.6K | 20,569 |
| Jun 30, 2023 | Romanelli Joseph | President, Human Health Int?l | Buy | 409 | $108.40 | $44.3K | 20,631 |
| Jun 30, 2023 | Romanelli Joseph | President, Human Health Int?l | Sell | 35 | $104.65 | $3.7K | 20,596 |
| May 5, 2023 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 53,400 | $119.01 | $6.36M | 60,085-47% |
| May 5, 2023 | Zachary Jennifer | EVP, General Counsel | Sell | 19,141 | $117.59 | $2.25M | 35,128-35% |
| May 5, 2023 | Karachun Rita A | Sr. VP Fince-Global Controller | Sell | 15,875 | $117.53 | $1.87M | 45,710-26% |
| May 3, 2023 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 7,509 | $116.82 | $877.2K | 11,059-40% |
| May 2, 2023 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 141,599 | $115.55 | $16.36M | 154,493-48% |
| Apr 28, 2023 | Davis Robert M | Chairman, CEO & President | Sell | 143,329 | $114.93 | $16.47M | 271,817-35% |
| Apr 14, 2023 | Chattopadhyay Sanat | Exe V-P & Pres. MMD | Sell | 134,055 | $115.07 | $15.43M | 67,892-66% |
Showing 1–50 of 79
1 / 2
MRK Insider Buying Activity
The following table shows recent insider purchases of Merck & Co., Inc. (MRK) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Mar 11, 2024 | Merck & Co., Inc. | Buy | 21,397,205 | $23.00 | $492.14M0.9% OS | 1,000 | |
| Jun 30, 2023 | Romanelli Joseph | President, Human Health Int?l | Buy | 409 | $108.40 | $44.3K | 20,631 |
MRK Insider Selling Activity
The following table shows recent insider sales of Merck & Co., Inc. (MRK) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Aug 13, 2026 | Guindo Chirfi | officer: EVP, Access, Policy & Comms | Sell | 10,000 | $135.00 | $1.35M | 36,613 |
| Aug 13, 2026 | Zachary Jennifer | officer: EVP, General Counsel | Sell | 80,315 | $133.46 | $10.72M | 45,509-64% |
| Aug 12, 2026 | DeLuca Richard R. | officer: EVP&Pres, Merck Animal Heallth | Sell | 45,320 | $131.12 | $5.94M | 134,703-25% |
| Aug 10, 2026 | DeLuca Richard R. | officer: EVP&Pres, Merck Animal Heallth | Sell | 6,050 | $130.38 | $788.8K | 160,732 |
| Aug 7, 2026 | Maraldo David R. | officer: EVP & Pres. MMD | Sell | 2,686 | $128.72 | $345.7K | 18,212 |
| Aug 7, 2026 | Guindo Chirfi | officer: EVP, Access, Policy & Comms | Sell | 15,000 | $131.00 | $1.97M | 46,613 |
| Aug 7, 2026 | Williams David Michael | officer: EVP,Chief Info&Digital Officer | Sell | 34,705 | $128.77 | $4.47M | 31,716-52% |
| Feb 12, 2026 | Guindo Chirfi | officer: Chief Marketing Officer | Sell | 10,000 | $121.46 | $1.21M | 60,615 |
| Feb 10, 2026 | Li Dean Y | officer: Executive VP & President, MRL | Sell | 10,235 | $117.52 | $1.20M | 92,035 |
| Feb 9, 2026 | Guindo Chirfi | officer: Chief Marketing Officer | Sell | 10,000 | $118.41 | $1.18M | 70,615 |
| Feb 9, 2026 | Zachary Jennifer | officer: EVP, General Counsel | Sell | 38,835 | $119.15 | $4.63M | 68,916-36% |
| Feb 6, 2026 | Davis Robert M | director, officer: Chairman, CEO & President | Sell | 47,434 | $118.04 | $5.60M | 476,064 |
| Feb 6, 2026 | Li Dean Y | officer: Executive VP & President, MRL | Sell | 15,087 | $118.77 | $1.79M | 102,270 |
| Feb 6, 2026 | DeLuca Richard R. | officer: EVP&Pres, Merck Animal Heallth | Sell | 37,685 | $120.92 | $4.56M | 160,174 |
| Feb 6, 2026 | Litchfield Caroline | officer: EVP & CFO | Sell | 41,997 | $119.61 | $5.02M | 90,192-32% |
| Feb 6, 2026 | Guindo Chirfi | officer: Chief Marketing Officer | Sell | 20,000 | $121.88 | $2.44M | 80,615 |
| Feb 6, 2026 | Williams David Michael | officer: EVP,Chief Info&Digital Officer | Sell | 5,000 | $121.91 | $609.5K | 30,838 |
| Feb 6, 2026 | Oosthuizen Johannes Jacobus | officer: President, U.S. Market | Sell | 15,000 | $121.87 | $1.83M | 21,197-41% |
| Feb 6, 2026 | Smart Dalton E. III | officer: SVP Fin. - Global Controller | Sell | 6,400 | $119.68 | $765.9K | 10,605-38% |
| Nov 4, 2025 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 8,614 | $83.59 | $720.0K | 0 |
| Aug 5, 2025 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 8,432 | $79.29 | $668.6K | 0 |
| May 2, 2025 | Smart Dalton E. III | SVP Fin. - Global Controller | Sell | 290 | $84.05 | $24.4K | 0 |
| May 2, 2025 | Larson Betty D | EVP, Chief HR Officer | Sell | 5,153 | $84.71 | $436.5K | 0 |
| Apr 29, 2025 | Smart Dalton E. III | SVP Fin. - Global Controller | Sell | 4,262 | $82.76 | $352.7K | 0 |
| Feb 20, 2025 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 8,500 | $84.09 | $714.7K | 0 |
| Feb 11, 2025 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 6,404 | $87.28 | $558.9K | 0 |
| Feb 7, 2025 | Downing Cristal N | Chief Comm. & Public Afrs Ofcr | Sell | 2,361 | $88.76 | $209.6K | 0 |
| Feb 15, 2024 | Davis Robert M | Chairman, CEO & President | Sell | 235,021 | $125.69 | $29.54M | 373,651-39% |
| Feb 15, 2024 | Litchfield Caroline | EVP & CFO | Sell | 38,291 | $125.50 | $4.81M | 50,908-43% |
| Feb 14, 2024 | Romanelli Joseph | President, Human Health Int?l | Sell | 1,000 | $124.89 | $124.9K | 19,569 |
| Feb 12, 2024 | Li Dean Y | Executive VP & President, MRL | Sell | 14,702 | $125.50 | $1.85M | 46,242 |
| Feb 8, 2024 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 1,451 | $127.57 | $185.1K | 19,812 |
| Feb 5, 2024 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 18,959 | $127.17 | $2.41M | 23,327-45% |
| Feb 2, 2024 | Zachary Jennifer | EVP, General Counsel | Sell | 49,499 | $126.97 | $6.28M | 29,058-63% |
| Feb 2, 2024 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 50,694 | $126.65 | $6.42M | 23,619-68% |
| Nov 13, 2023 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 2,081 | $102.38 | $213.1K | 18,191 |
| Nov 9, 2023 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 43,823 | $105.03 | $4.60M | 111,764-28% |
| Aug 15, 2023 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,250 | $109.01 | $463.3K | 22,935 |
| Aug 4, 2023 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,500 | $105.49 | $474.7K | 27,185 |
| Aug 3, 2023 | Romanelli Joseph | President, Human Health Int?l | Sell | 89 | $107.37 | $9.6K | 20,569 |
| Jun 30, 2023 | Romanelli Joseph | President, Human Health Int?l | Sell | 35 | $104.65 | $3.7K | 20,596 |
| May 5, 2023 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 53,400 | $119.01 | $6.36M | 60,085-47% |
| May 5, 2023 | Zachary Jennifer | EVP, General Counsel | Sell | 19,141 | $117.59 | $2.25M | 35,128-35% |
| May 5, 2023 | Karachun Rita A | Sr. VP Fince-Global Controller | Sell | 15,875 | $117.53 | $1.87M | 45,710-26% |
| May 3, 2023 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 7,509 | $116.82 | $877.2K | 11,059-40% |
| May 2, 2023 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 141,599 | $115.55 | $16.36M | 154,493-48% |
| Apr 28, 2023 | Davis Robert M | Chairman, CEO & President | Sell | 143,329 | $114.93 | $16.47M | 271,817-35% |
| Apr 14, 2023 | Chattopadhyay Sanat | Exe V-P & Pres. MMD | Sell | 134,055 | $115.07 | $15.43M | 67,892-66% |
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